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package fj.data; import static fj.data.Validation.parseInt; import static fj.data.Validation.condition; import fj.P3; import fj.P; import fj.Bottom; import fj.pre.Semigroup; import fj.pre.Show; import static fj.pre.Show.validationShow; import static fj.pre.Show.nonEmptyListShow; import static fj.pre.Show.stringShow; import static fj.pre.Show.p3Show; import static fj.pre.Show.intShow; import static fj.pre.Show.booleanShow; import static java.lang.Character.isUpperCase; public final class ValidationTest { static final Show<Validation<NonEmptyList<String>, P3<Integer, String, Boolean>>> show = validationShow(nonEmptyListShow(stringShow), p3Show(intShow, stringShow, booleanShow)); public static void main(final String[] args) { // age must parse as an integer, otherwise, return the exception's toString final Validation<String, Integer> age = parseInt(args[0]).f().map(Bottom.<NumberFormatException>eToString()); // name must start with a capital letter final Validation<String, String> name = condition(!args[1].isEmpty() && isUpperCase(args[1].charAt(0)), "First character of the name must be upper-case", args[1]); // must be "male" or "female" or error message final Validation<String, Boolean> female = args[2].equals("female") ? Validation.<String, Boolean>success(true) : args[2].equals("male") ? Validation.<String, Boolean>success(false) : Validation.<String, Boolean>fail("gender must be male or female"); // accumulate validation final Validation<NonEmptyList<String>, P3<Integer, String, Boolean>> acc = age.nel().accumulate(Semigroup.<String>nonEmptyListSemigroup(), name.nel(), female.nel(), P.<Integer, String, Boolean>p3()); // well? show.println(acc); } } /* > java ValidationTest 42 Bob male Success((42,Bob,false)) > java ValidationTest 27 Mary female Success((27,Mary,true)) > java ValidationTest x Bob male Fail([java.lang.NumberFormatException: For input string: "x"]) > java ValidationTest 23 mary female Fail([First character of the name must be upper-case]) > java ValidationTest 46 Bob both Fail([gender must be male or female]) > java ValidationTest old mary female Fail([java.lang.NumberFormatException: For input string: "old",First character of the name must be upper-case]) > java ValidationTest old Bob neither Fail([java.lang.NumberFormatException: For input string: "old",gender must be male or female]) > java ValidationTest 42 mary neither Fail([First character of the name must be upper-case,gender must be male or female]) > java ValidationTest young fred none Fail([java.lang.NumberFormatException: For input string: "young",First character of the name must be upper-case,gender must be male or female]) */

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